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/*
* Actions Semi Owl Smart Power System (SPS)
*
* Copyright 2012 Actions Semi Inc.
* Author: Actions Semi, Inc.
*
* Copyright (c) 2017 Andreas Färber
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/pm_domain.h>
#include <linux/soc/actions/owl-sps.h>
#include <dt-bindings/power/owl-s500-powergate.h>
struct owl_sps_domain_info {
const char *name;
int pwr_bit;
int ack_bit;
unsigned int genpd_flags;
};
struct owl_sps_info {
unsigned num_domains;
const struct owl_sps_domain_info *domains;
};
struct owl_sps {
struct device *dev;
const struct owl_sps_info *info;
void __iomem *base;
struct genpd_onecell_data genpd_data;
struct generic_pm_domain *domains[];
};
#define to_owl_pd(gpd) container_of(gpd, struct owl_sps_domain, genpd)
struct owl_sps_domain {
struct generic_pm_domain genpd;
const struct owl_sps_domain_info *info;
struct owl_sps *sps;
};
static int owl_sps_set_power(struct owl_sps_domain *pd, bool enable)
{
u32 pwr_mask, ack_mask;
ack_mask = BIT(pd->info->ack_bit);
pwr_mask = BIT(pd->info->pwr_bit);
return owl_sps_set_pg(pd->sps->base, pwr_mask, ack_mask, enable);
}
static int owl_sps_power_on(struct generic_pm_domain *domain)
{
struct owl_sps_domain *pd = to_owl_pd(domain);
dev_dbg(pd->sps->dev, "%s power on", pd->info->name);
return owl_sps_set_power(pd, true);
}
static int owl_sps_power_off(struct generic_pm_domain *domain)
{
struct owl_sps_domain *pd = to_owl_pd(domain);
dev_dbg(pd->sps->dev, "%s power off", pd->info->name);
return owl_sps_set_power(pd, false);
}
static int owl_sps_init_domain(struct owl_sps *sps, int index)
{
struct owl_sps_domain *pd;
pd = devm_kzalloc(sps->dev, sizeof(*pd), GFP_KERNEL);
if (!pd)
return -ENOMEM;
pd->info = &sps->info->domains[index];
pd->sps = sps;
pd->genpd.name = pd->info->name;
pd->genpd.power_on = owl_sps_power_on;
pd->genpd.power_off = owl_sps_power_off;
pd->genpd.flags = pd->info->genpd_flags;
pm_genpd_init(&pd->genpd, NULL, false);
sps->genpd_data.domains[index] = &pd->genpd;
return 0;
}
static int owl_sps_probe(struct platform_device *pdev)
{
const struct of_device_id *match;
const struct owl_sps_info *sps_info;
struct owl_sps *sps;
int i, ret;
if (!pdev->dev.of_node) {
dev_err(&pdev->dev, "no device node\n");
return -ENODEV;
}
match = of_match_device(pdev->dev.driver->of_match_table, &pdev->dev);
if (!match || !match->data) {
dev_err(&pdev->dev, "unknown compatible or missing data\n");
return -EINVAL;
}
sps_info = match->data;
sps = devm_kzalloc(&pdev->dev, sizeof(*sps) +
sps_info->num_domains * sizeof(sps->domains[0]),
GFP_KERNEL);
if (!sps)
return -ENOMEM;
sps->base = of_io_request_and_map(pdev->dev.of_node, 0, "owl-sps");
if (IS_ERR(sps->base)) {
dev_err(&pdev->dev, "failed to map sps registers\n");
return PTR_ERR(sps->base);
}
sps->dev = &pdev->dev;
sps->info = sps_info;
sps->genpd_data.domains = sps->domains;
sps->genpd_data.num_domains = sps_info->num_domains;
for (i = 0; i < sps_info->num_domains; i++) {
ret = owl_sps_init_domain(sps, i);
if (ret)
return ret;
}
ret = of_genpd_add_provider_onecell(pdev->dev.of_node, &sps->genpd_data);
if (ret) {
dev_err(&pdev->dev, "failed to add provider (%d)", ret);
return ret;
}
return 0;
}
static const struct owl_sps_domain_info s500_sps_domains[] = {
[S500_PD_VDE] = {
.name = "VDE",
.pwr_bit = 0,
.ack_bit = 16,
},
[S500_PD_VCE_SI] = {
.name = "VCE_SI",
.pwr_bit = 1,
.ack_bit = 17,
},
[S500_PD_USB2_1] = {
.name = "USB2_1",
.pwr_bit = 2,
.ack_bit = 18,
},
[S500_PD_CPU2] = {
.name = "CPU2",
.pwr_bit = 5,
.ack_bit = 21,
.genpd_flags = GENPD_FLAG_ALWAYS_ON,
},
[S500_PD_CPU3] = {
.name = "CPU3",
.pwr_bit = 6,
.ack_bit = 22,
.genpd_flags = GENPD_FLAG_ALWAYS_ON,
},
[S500_PD_DMA] = {
.name = "DMA",
.pwr_bit = 8,
.ack_bit = 12,
},
[S500_PD_DS] = {
.name = "DS",
.pwr_bit = 9,
.ack_bit = 13,
},
[S500_PD_USB3] = {
.name = "USB3",
.pwr_bit = 10,
.ack_bit = 14,
},
[S500_PD_USB2_0] = {
.name = "USB2_0",
.pwr_bit = 11,
.ack_bit = 15,
},
};
static const struct owl_sps_info s500_sps_info = {
.num_domains = ARRAY_SIZE(s500_sps_domains),
.domains = s500_sps_domains,
};
static const struct of_device_id owl_sps_of_matches[] = {
{ .compatible = "actions,s500-sps", .data = &s500_sps_info },
{ }
};
static struct platform_driver owl_sps_platform_driver = {
.probe = owl_sps_probe,
.driver = {
.name = "owl-sps",
.of_match_table = owl_sps_of_matches,
.suppress_bind_attrs = true,
},
};
static int __init owl_sps_init(void)
{
return platform_driver_register(&owl_sps_platform_driver);
}
postcore_initcall(owl_sps_init);
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